Bohemian knotweed is a vigorous and fertile hybrid that is the result of a cross between Japanese and giant knotweed.

​Physical DescriptionThere is a high degree of morphological variability in Bohemian knotweed. Physical characteristics of bohemian knotweed range from being indistinguishable from Japanese knotweed to being indistinguishable from giant knotweed, with most individuals exhibiting intermittent characteristics between the two species.

Broadly ovate to narrowly ovate leaf with a flat to heart shaped base that are 7-14 inches long

6-11 feet tall

Green segmented stems with or without red to brown spotting that are variable width

Stout leaf hairs up to 1/2 mm long

The cross section of the middle leaf vein is square to slightly rounded in shape

Papery sheaths between stem sections

Hollow stems

Cream colored, sweet smelling, linear flower bunches at each leaf. That often appear to have a more upright appearance than Japanese or giant knotweed

Spectrum of leaf shapes of Japanese, giant and hybrid bohemica knotweed species

​Control EffortsBohemian knotweed infestations take several years of treatment to control and the most effective method is repeated herbicide application. Contacting a natural resource professional as early as possible is integral to knotweed control. If you see bohemian knotweed contact the Oregon Invasives Hotline as well as Lincoln SWCD by phone at 541.265.2653 or email.

Click the link below for an in-depth summary of current knotweed control practices: